Bsi bs au 150b 1984 (2000)

BRITISH STANDARD AUTOMOBILE SERIES BS AU 150b 1984 (Superseding the first revision (1973) of BS AU 150) Specification for Automotive V belts and pulleys UDC 629 113 01 621 85 052 42 BS AU 150b 1984 Th[.]

Specification for

U C 6 9.1 3.0 :6 1.8 0 2.4

This Bri shStan ard, ha ing

b en pre ared u der the

directonof the Automo ile

Stan ards Commi e an

theMechanical Eng ine ring

Stan ards Commi e ,was

published u der the authoriy

ofthe Bo rd of BSI an comes

into fect on

3 April1 8

© BSI0 -2 0

Fir t published1 6

Fir t re ision July1 7

Secon re ision April1 8

The folowing BSI references

relate to the work on this

The prep ration of this BritishStand rd was entrusted b the Mechanical

Eng ine ring Stand rd s Commit e ( MEE/ -) and the Automobie Stand rd s

Commit e ( AUE/ -) to Technical Commit e MEE/76 upon which the folowing

bod ies were represented:

Ag ricultural Eng ine r ’ Association

British Gear Man facturer ’ Association

British Rub er Man facturer ’ Association

National Coal Board

Society of Motor Man facturer and Tra er Limited

Co pted member

Am endm ents is ued sinc publ cation

Amd No Date of is ue Comments

Commit e s responsible Inside font cov er

Appendix A Information to be sup l ed b the pur haser 8

Appendix D Determination of electrical resistance of belts 1

Appendix G Determination of belt resistance to low temperature 14

Appendix H Determination of belt resistance to hig h temperature 14

Append ix K Guid nce an calculations for d riv e desig n 14

Fig ure 3 — Gro v e c os section of measuring fixture pul ey 4

Fig ure 4 — Mean v alue fof belt rid e-out on measuring puley 4

Fig ure 8 — App ratus for measuring the electrical resistance of belts 13

Fig ure 9 — Arrang ement for ra ial ru -out measurement 14

Pag e

Fig ure 10 — Arrang ement for a ial ru -out measurement 14

Ta le 2 — Dimensions an characteristic of measuring fixture pul ey s 3

Ta le 5 — Recommended nominal belt leng ths for AV10 g ro v e section 8

Ta le 6 — Recommended nominal belt leng ths for AV13 g ro v e section 9

Ta le 7 — Dimensions and characteristic of test pul ey s 10

Ta le 10 — Arc of contact factor K

Automobie Stand rd s Commit e and the Mechanical Eng ine ring Stand rds

Commit e The object is to prov ide stand rd dimensions, q ual ty control test

proced ures and desig n d ta for automotiv e V -belts an their cor esponding

pul ey s, b sed on practical ex erience of both man facturer and user This

rev ision super edes the19 3 edition which is withdrawn

In this stand rd req uirements for the puley g ro v e profie are specified but

req uirements for the fit of the belt in the g ro v e are only specified for the purposes

of leng th measurement and ac urate spe d ratio d etermination Nominal

dimensions of belts are specified solely for information for user an no

req uirements are g iv en for belt per ormance

This stand ard is tech ical y eq uiv alent to ISO27 0:19 4 and ISO528 :19 8,

publshed b the International Org anization for Stand rd ization ( ISO), but,

whereas ISO27 0 uses the “pitch” wid th of the belt sy stem this stand rd uses the

“ efectiv e width” of the pul ey sy stem

A British Stand rd d oes not purport to includ e al the neces ary prov isions ofa

contract User of British Stand ard s are responsible for their cor ect a plcation

Compl anc with a British Standard does not ofitself confer imm unity

f om leg al o l g ations

Sum m ary of pag es

This d ocument comprises a f ont cov er, an insid e font cov er, p g esi toiv ,

p g es1 to18, an inside b ck cov er an a b ck cov er

This stand ard has be n up ated ( se copy right d te) and ma hav e ha

amend ments incorporated This wi l be indicated in the amendment ta le on the

Section 1 General

This BritishStand rd specifies the nominal c os

section d imensions for V-belts and the desig n and

construction of the cor esponding puley s used for

d riv ing the auxi iaries of automotiv e power units

an their deriv ativ es

Recommend ed nominal belt leng ths are g iv en in

Appendix B Appendix K giv es g uid nce on the

calculations for driv e d esig n

This stand rd do s not specify requirements for belt

per ormance

NOT The t les of the publicatons refered to in this stan ard

are listed on the inside b ck co er

1.2 Definitions

For the purposes ofthis BritishStand rd the

fol owing d efinitions a ply

1.2.1

V- g ro ved puley

a pul ey with one or more g ro v es arou d the

cir umference The g ro v es hav e profies of a

truncated , non-tru cated or rou ded “ V ” that is

sy mmetrical to the pul ey a is

1.2.2

efe tive width, W

e

a g ro v e wid th d imension characterizing the g ro v e

profie It is a d efined v alue not subject to tolerance

( se Fig ure 1)

NOT For al b lt me suring pule s, the efectv width

coincides wih the actual to width of the g ro v wihin the

sp cified tolerances

1.2.3

efe tive diam eter, d

e

the diameter of the pul ey at the efectiv e wid th of

the pul ey g ro v e ( se Fig ure 3 and Fig ure 6)

1.2.4

pitch diam eter

the efectiv e d iameter cor ected for the efectiv e lne

efe tive l ne diferential

the rad ial d isplacement betwe n the lev els of the

efectiv e width of the pul ey and the pitch width of

the belt ( se Fig ure 1)

NOT W hen the efectv line diferental is zero, the pich

width of the b lt an the efectv width of the pule are

coincident

NOT 2 The efectv e line diferental is used to o tain pich

diameter fom the efectv diameter an hence calculate the

sp ed rato

1.2.7

V- belt

an endles flexible belt hav ing a c os section that

a proximates to a reg ular tra e ium On a c os

section of a straig ht sided belt, the tra e ium is

outlned b the b se, sid es and top of the belt The

inter ection of the extended profi es of the b se,

sides and top oc ur when the corner are cut short

or rou d ed

1.2.8

V- belt drive

a driv e comprising one or more belts mou ted on

V-g ro v ed puley s The profies of the belts and the

puley g ro v es are such that the belts only come into

contact with the sid es of the pul ey g ro v es an not

with the b se of the g ro v es

1.2.9

spe d ratio

the ratio of the n mber of rev olutions of the puley s,

calculated f om the ratio of the pitch diameter of

the puley s

1.2.10

to width, W

the larg er width of the tra e ium outl ned on a c os

section (se Fig ure 5)

1.2.1

heig ht, T

the heig ht of the tra e ium outlned on a c os

section (se Fig ure 5)

1.2.12

ang le, A

the included ang le obtained b extend ing the side of

the belt ( se Fig ure 5)

1.2.13

efe tive leng th, L

e

the leng th of a lne cir ums ribing a belt at the

efectiv e d iameter of the measuring puley s

1.2.14

ride- out

the d istance fom the top of the belt to the efectiv e

wid th lev el of the puley

1.2.15

g ro ve ang le, a

the includ ed ang le obtained b extending the sides

of the pul ey g ro v es ( se Fig ure 3 and Fig ure 6)

NOT For any g iv n b lt secton the pule gro v ang le wil

ha e a v lue de en ent on the efectv diameter of the pule

1.2.16

efe tive circum ferenc , C

e

the cir umference of a cir le with a diameter equal

to the efectiv e diameter

Section 2 Belts

2.1 Desig na tion

Belts shal be desig nated b the g ro v e profi e in

which they are intended to be ru as AV10 or AV13

an b their nominal efectiv e leng th

2.2 Cros section dimensions

The nominal c os section d imensions and the

nominal includ ed ang le shal be as g iv en in Ta le 1

2.3 Efective leng th

2.3.1 General The efectiv e leng th shal be

measured in ac ord ance with2.3.2

NOT No re uirements are sp cified for efectv leng th: these

should b sp cified b the pur haser [se App n ix Aa)

2.3.2 Metho ofmeasurem ent

2.3.2.1 Mea sur ing fixtur e The measuring fix ture

shal consist of two pul ey s with dimensions as

shown in Ta le 2 and lay out as shown in Fig ure 2,

with a g ro v e section as shown in Fig ure 3, and with

one puley centre fixed The other puley shal be

mov ea le in a plane at rig ht ang les to the a es of the

pul ey s and in a lne with the g ro v es of the pul ey s

The pul ey s shal be fuly rotata le and a means of

a ply ing a measuring for e shal be prov id ed

2.3.2.2 Pr oc d ur e Mou t the belt on the measuring

fixture(2.3.2.1) and position in the g ro v es u der

the for es g iv en in Ta le 3 Rotate the pul ey s at

least twice to seat the belt properly , before making

any measurements, so that the measuring for e F is

eq ualy div ided betwe n the two strands of the belt

Determine the efectiv e leng th L

e( in mm) of the belt

fom the fol owing equation:

Ta le 1 — Nominal dim ensions of belt cros se tion

Ta le 2 — Dim ensions and characteristics of m easuring fixture pul eys

Ta le 3 — Belt measuring forc

2.4 Tolerances on nomina l belt leng th

The tolerance on nominal belt leng th shal

be±0.6% or±6mm, whichev er is the g reater

NOT App n ix B g iv es a rang e of recommen ed nominal b lt

leng ths

2.5 Matched set tolerance

In order to av oid an u ev en d istribution of load ,

belts used on a multi belt d riv e shal be leng th

matched The ma imum v ariation in leng th within

a matched set shal be0.2 % or2 mm, whichev er is

the g reater

2.6 Variation ofbelt cros section

The v ariation of the belt c os section shal be such

that, when the belt is rotated slowly for at least one

complete rev olution of leng th on the measuring

fixture d es ribed in2.3.2.1, the puley centre

d istance shal not v ary b more than1.0mm

2.7 Variation ofbelt ride- out

Except for v ariations d ue to fa ric splces or brand

identifications, the v ariation in the belt ride-out

shal be not more than1.0mm when the belt is

rotated slowly for at least one complete rev olution of

leng th on the measuring fixture des ribed

in2.3.2.1

NOT Variatons d e to fa ric splices or bran identficatons

should b ig nored

2.8 Mea n value ofride- out

The mean v alue fof the rid e-out ( se Fig ure 4) for

the belts g iv en in Ta le 5 and Ta le 6 shal not

NOT This fig ure is diag rammatc only

Fig ure 2 — La out of m easuring fixture

Dis anc betwe n

exte nal tang ent

2.9 Belt test l f

Belt test l fe shal be determined in ac ord ance with

Appendix C

N T App n ix C determines the b lt test life only No

re uirements are sp cified for service b ha iour an life:this

should b sp cified b the pur haser [ se App n ix Ab)

2.10 Electrical resistance

For new, complete,end les an antistatic belts the

electrical resistance ( in 7 ), when d etermined in

ac ord nce with Appendix D, shal be not g reater

than the fol owing :

N T For g eneral informaton on electrical resistance of

con uctv an ant-statc prod cts made fom fle ible p lymeric

material se BS2 5

Fig ure 3 — Gro ve cros se tion of measuring fixture pul ey

Fig ure 4 — Mea n v lue fof belt ride- out on

measuring pul ey

where

L is the d ry distance betwe n electrod es

( inmm);

I is the sum of the leng ths of the two sloping

sides of the belt ( i mm) =2 Tsec (A/2)

2.11 Resistance to ozone

W hen tested in ac ord ance with Appendix E the belt

shal show no sig n of c acking , sep ration or any

other deterioration l kely to imp ir serv ice

behav iour and lfe

NOT No re uirements are sp cified for service b ha iour an

life: this should b sp cified b the purhaser [se App n ix Ab)

2.12 Resistance to oi

Resistance to oi shal be d etermined in ac ord nce

with Appendix F

NOT No re uirements are sp cified for resistance to oil:this

should b sp cified b the purhaser [ se App n ix Ad)

2.13 Hardnes ofrubber cor

Hardnes of the rub er core shal be determined in

ac ord nce with BS9 3-A26

NOT No re uirements are sp cified for hard es : this should

b sp cified b the pur haser [se App nd ix Ae)

2.14 Resistance to low temperature

W hen tested in ac ord nce with Appendix G the belt

shal be f e fom c acks or other v isible defects that

would imp ir serv ice behav iour and l fe

[ se Appendix Ab)]

2.15 Resistance to hig h temperature

W hen tested in ac ord nce with Appendix H the belt

shal be f e fom c acks or other v isible defects that

would imp ir serv ice behav iour and l fe

[ se Appendix Ab)]

2.16 Ma rking

Belts shal be marked leg ibly an d ura ly on the

outer non-working sur ace with the belt desig nation

specified in2.1 or the pur haser’s p rt n mber

NOT I is recommen ed that the folowing sy stem b used for

the marking of b lts:

Section 3 Pul eys

NOT No re uirements are sp cified for b lancing of pule s

which should not g eneraly b neces ary.Howe er, i is

considered neces ary in certain cases, e.g for relatv ly mas iv

cast iron pule s,cast u machined puley s an for pule s

ru ning at hig h sp ed In these cases b lancing of pule s should

b sp cified b the purhaser [ se App n ix Af)

3.1 Desig n a nd construction

Pul ey s shal be d esig ned and constructed so as to

me t the requirements for serv ice behav iour an l fe

as specified b the pur haser [se Append ix Ab)]

Stifnes shal be such that no sig nificant d eflection

of the pul ey g ro v e sides oc ur under normal

operating conditions

NOT The tensile streng th of the material should b suficient

to wihstan the centrifug al stres to b imp sed in service

b ha iour an life [ se App n ix Ab)

NOT No re uirements are sp cified for the efectv diameter

of pule s as this de en s on the b lt constructon to b used an

should b sup lied b the man facturer Howev er,Ta le 4 g iv s

recommen ed v lues

3.2.1 Pul ey g ro ves W hen measured either

directly or with b ls or roler the d imensions of

puley g ro v es shal be as g iv en in Ta le 4 an as

shown in Fig ure 6

NOT Addi onal data for me surement b b ls or roler is

g iv n in Ta le 4 an Fig ure 6

3.2.2 Multi- g ro ved m achined pul eys for use

with m atched belt sets W hen g aug e b ls or

rol er are used , the efectiv e diameter d

e+2X

e

( se Ta le 4) shal not v ry f om g ro v e to g ro v e b

more than0.0 mm per25mm of the efectiv e

diameter with an up er lmit of0.3 mm

3.3 Desig na tion

Pul ey s shal be d esig nated b the folowing :

a) the efectiv e diameter ( in mm);

b) the n mber of g ro v es;

c) the g ro v e profie ( AV10 or AV13)

Exa mple:

5 × 1AV10

In the case of integ ral puley s with d iferent g ro v es,

suc es iv e desig nation of the elements shal

beused ,e.g :

7 × 1AV13, 5 ×1 AV10

Fig ure 5 — Belt cros se tion

Gro ve se tion desig nation Ef ctive length

Ta le 4 — Dim ensions and characteristics of pul eys

ef ctive diam ete

d

ea

Dis anc fom e fctive

diam ete to the exte nal

tang ent of b ls/role s, at

The efectv diameter for a p rtcular secton is de en ent on the b lt constructon used The pur haser should re uest the

man facturer to sup ly this informaton.The v lues g iv n are recommen ed v lues If diferent ang les of a pule are re uired, the

g r oo e flan s should hing e a out the efectv line

1 0 + 0.3

3.4 Sur ace ofg rooves

The surace finish of g ro v es shal be not more

than3.2 4 m R

a

when determined b the method

des ribed in BS1 3 -1 The g ro v e sur ace of ste l

puley s shal hav e a hardnes of not les

than13 HB when tested in ac ord ance with

BS24 -1

3.5 Cast iron pul eys

Cast iron used for puley s shal be close-g rained and

f e fom porosity Machined puley s shal hav e no

blowholes in the g ro v e

3.6 Axial a nd radial run- out

W hen measured in ac ord ance with Append ix J the

a ial ru -out of a machined puley on its shaft shal

not exce d0.0 2 mm per mi imetre of puley

d iameter or0.3mm, whichev er is the g reater

The a ial run-out of a pres ed , spl t or u machined

puley on its shaft shal not exce d0.3mm

W hen measured in ac ord ance with Append ix J the

ra ial run-out of the pul ey on its shaft shal not

exce d0.3mm

The d iameter of the b l s or roler used shal be not

les than those g iv en in Ta le 2